The new HELIOS Universal User licenses give companies high flexibility in serving all types of local and remote computers, workstations, and mobile devices. The cross-platform Spotlight indexing and searching capabilities provide fast and uniform access to content stored on a file server software for any connected client across the network. HELIOS Synchronization Service enables folders, volumes, and entire disks to be synced to make a second copy of the data available to better serve a remote location, or for backup purposes.

HELIOS Universal File Server software also includes HELIOS IT Monitor Server, which allows IT infrastructure monitoring with push notification to admins using iOS devices, upon server overload or service failure. HELIOS File Server software settings, including authentication and access permissions, are easily configured with HELIOS Admin, the graphical administration tool for Mac, Windows and Linux clients.

To be honest, simple file sharing like this is something quite limited. There's a set of good file servers available but nowadays companies also need real document management, with not just file archiving but also collaboration, workflow and other more advanced features.
We were happy with LogcialDOC - http://www.logicaldoc.com
but you can choose among a set of DMS available on the market.